Ratchet Latch Connector for Wellhead Tool Retrieval
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Solution Overview
Problem
Current wellhead systems lack an efficient mechanism for setting and retrieving wellhead testing equipment from positions below the BOP rams, requiring complex hydraulic or electrical signaling for disconnection and reattachment.
Innovation Solution
A ratchet latch connector system utilizing a split ring mechanism with a detent and threaded engagement allows for quick and simple disconnection and reconnection of tools from a tubular string via axial and rotational movement, enabling mechanical operation without hydraulic or electrical signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hydraulic or electrical signaling systems are used for disconnection and reattachment, then connection reliability is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex hydraulic or electrical signaling systems with a purely mechanical ratchet latch mechanism. The connector uses a ratchet tooth and pawl system that mechanically engages to lock the connector in place, and a simple manual release mechanism that disengages the latch. This mechanical substitution eliminates the need for complex hydraulic lines, electrical connectors, and control systems while maintaining reliable connection and disconnection functionality.
2Productivity
If quick disconnect mechanisms are implemented, then operation speed is improved, but connection security deteriorates
Solution Approach 1:
The ratchet latch mechanism incorporates dynamic elements including a spring-loaded pawl that automatically engages with ratchet teeth to secure the connection, and a controlled release mechanism that requires deliberate manual intervention. The spring provides continuous force to maintain engagement, while the ratchet geometry prevents backward movement. This dynamic design enables quick connection through simple insertion while maintaining secure locking through automatic engagement, and controlled disconnection through a deliberate release action.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables reliable and efficient landing, operation, and retrieval of test tools in wellheads, facilitating single-trip connections and disconnections, and maintaining tool security during testing without complex signaling systems.
Implementation Method 1
The split ring is flexible and thus is able to transition between a radially expanded position and a radially collapsed position
Implementation Method 2
The connector features a quick connect/release mechanism that may be controlled from the surface via axial and rotational movement of the tubular string
Data Source
AI summary
A system including a releasable connector having a housing and a split ring, and a complementary mandrel that is attachable/detachable from the connector, is provided. The mandrel is designed to be received into the housing such that a portion of the mandrel extends out of the housing for connection to a tool. The split ring is disposed in an annular space between the housing and the mandrel when the mandrel is in the housing. The split ring includes at least one set of threads and a detent formed on a radially internal surface, and the mandrel includes complementary threads. The threads on the split ring fully engage the complementary threads on the mandrel when the mandrel is in a particular axial position within the housing. The detent prevents the split ring from collapsing into engagement with the threads on the mandrel until the mandrel is in a desired axial position.